Fig. 7. Appearance of integrated intensity of selected lines in the circumstellar disk model at resolutions attainable with current and planned interferometric facilities. The first three columns from the left show CO 1-0 at resoltuion, CO 1-0 at resolution, and CO 6-5 at resolution. A distance of 140 pc is adopted for the source, and inclination increases from to from top to bottom. The last three columns from the left show the emission in HCO⁺ 4-3, HCN 4-3, and CN at resolution. All panels are shown with a linear grey scale ranging from 0 to the image maximum in K km s^-1. Contours are drawn at 1%, 5%, 10%, 15%, 20%, 30%, 40%, 50%, 70%, and 90% of maximum.